(19)

(11)

EP 1 391 040 A2

(12)

(88) Date of publication A3: 27.11.2003 (43) Date of publication: 25.02.2004 Bulletin 2004/09 (21) Application number: 02734126.2 (22) Date of filing: 30.04.2002

(51) International Patent Classification (IPC)7: H03M 5/14, H04L 25/49 (86) International application number: PCT/US2002/013798 (87) International publication number: WO 2002/091586 (14.11.2002 Gazette 2002/46)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 08.05.2001 US 289556 P (71) Applicant: International Business Machines Corporation Armonk, NY 10504 (US)	(72) Inventor: WIDMER, Albert, X. Katonah, NY 10536 (US) (74) Representative: Williams, Julian David  IBM United Kingdom Ltd,MP 110,Hursley Park Winchester SO21 2JN Winchester SO21 2JN (GB)